Microphones

Question 1

What is the DC standard?

Answer 1

48v

Question 2

Active circuit?

Answer 2

a device that requires additional power

Question 3

Passive circuit?

Answer 3

a device that works through natural electromagnetic properties

Question 4

Capsule?

Answer 4

a transducer element of a given mic; what responds to air pressure?

Question 5

Active mics?

Answer 5

condensers

Question 6

Passive mics?

Answer 6

dynamic (moving coil) & ribbon

Question 7

Characteristics of dynamic mics?

Answer 7

• Good low-frequency response,
• Not good for high frequencies.
• Take high SPL, not very sensitive.
• Poor transient response
• durable

Question 8

A common use of dynamic mics?

Answer 8

• Live sound
• Drums & percussion
• Electric guitars
• Horns
• Vocals

Question 9

Common models of dynamic mics

Answer 9

• Shure SM57
• Shure SM58
• Akg D112
• Sennheiser MD 421

Question 10

How does it work (dynamic mics)?

Answer 10

Electromagnetic principle (wire coil and magnet to creat signal)

Question 11

Characteristics of ribbon mics?

Answer 11

• good low-frequency response
• good mid-range response
• extreme sensitivity to SPL
• Good transient response
• fragile diagram
• no 48v

Question 12

The common use of ribbon?

Answer 12

• strings
• horns
• woodwinds
• E gtrs

Question 13

Common models of ribbon?

Answer 13

• Royer R121
• Cole 4038
• RCA 77

Question 14

how does it work (ribbon mics)?

Answer 14

lightweight metal ribbon suspended btw the poles of a magnet and as it vibrates a voltage is induced and is picked off by contacts at the end of the ribbon.

Question 15

Characteristics of condenser mics?

Answer 15

• balanced low & mid frequencies + excellent highs
• sensitive to high SPL
• good transient
• requires 48v
• most common have selectable polar patterns

Question 16

Common uses of condensers?

Answer 16

• vocals
• OH
• acoustic instruments
• Piano

Question 17

2 types of DC for condenser?

Answer 17

• 48v & tube amplifier

Question 18

Common models of condensers?

Answer 18

• Akg C414s
• U 87
• KM 184
• Akg c451b

Question 19

Common models of condensers with tube DC?

Answer 19

• Akg C12
• U47
• M147 modern
• Manley Gold

Question 20

DI ?

Answer 20

used to convert unbalanced instrument level to balanced lin or mic lvl

Question 21

Active DI?

Answer 21

conversion is done with a power amplifier

Question 22

Passive DI?

Answer 22

conversion is done with a transformer

Question 23

Polar pattern?

Answer 23

• omni
• cardioid
• hypercardioid
• figure of 8
• shotgun

Question 24

stereo miking?

Answer 24

• AB
• XY
• ORTF
• Blumlein
• DECCA tree
• MS
• binaural

Question 25

AB?

Answer 25

• involves two spaced (usually omnidirectional) microphones to record the sound stage. difference in time
• space btw 40 to 60 cm

Question 26

XY coincident?

Answer 26

• 2 cardioid
• difference in audio volume
• 90° angled
• off-axis attenuation

Question 27

ORTF?

Answer 27

• difference in volume and time
• angled at 110° + spaced at 17cm
• cardioid
• ## mono compatible

Question 28

DECCA tree?

Answer 28

• omni
• orchestra rec (ferber)
• enfaite c’ AB + centre

Question 29

MS mid sides?

Answer 29

• cardioid + 8

- keep the cardio & copy the 8 signal then reverse the phase

Question 30

Blumlein?

Answer 30

• 2 matched mic of 8 (90°)

- surround feel

Question 31

Binaural?

Answer 31

• dummy head with 2 omni placed at the ears